Investigation Begins Into a Honolulu-area Near Miss

NTSB and FAA investigators are initially crediting the traffic alert and collision avoidance system (Tcas) with preventing an April 25 midair between United Airlines and US Airways Boeing 757s while both airliners were under the control of Honolulu ATC center. Both aircraft were flying at FL300 when the Tcas aboard the United aircraft warned the crew to descend. The aircraft reportedly came within 2.2 nm laterally of one another.